Potassium kinetics in potato as influenced by crop residues

Green house studies on an acidic soil of Fagu (Shimla) revealed significantly higher bio-mass, uptake of P and K by potato compared to control with the application of 100% PK along with residues of wheat or paddy. Application of PK in presence of crop residues resulted in higher assimilation of P and K in potato leaves at stolon formation stage. In laboratory study where the soil was subjected to slow equilibrium at 25°C using radiotracer ⁸⁶Rb, the organic residues of wheat, paddy or farmyard manure did not govern the potassium adsorption in this soil but it was time factor, which determined the adsorption rate of K/ ⁸⁶Rb.